We have found one software suitable in our database for this conversion.
It seems that pages-tef to docx conversion is not that different from standard pages to docx conversion and should be doable with existing Pages apps for MacOS or iOS. You probably cannot use any 3rd party program as .pages-tef files are not supported outside of standard Apple apps.
Updated: January 6, 2021
PAGES-TEF
A pages-tef file extension is related to the Apple Pages, a word processor for OS X (macOS) and iOS operating systems. A pages-tef file stores Pages document on iCloud.
DOCX
Files with docx file extension are documents written and saved using Microsoft Word word processor edition 2007 or later. DOCX format replaced the previously used DOC format, moving from a binary files to Open XML schema based documents. Supported in almost every modern word processing tools.
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